Implanted Human Body Sensor Network

1. An implantable body sensor network, comprising: a plurality of implant sensor nodes implanted in a human body; and a control device configured to create a cluster by transmitting cluster information to the plurality of implant sensor nodes, and set a role of each of the implant sensor nodes of the created cluster to be one of a relay node, a substitute node and an active node, wherein the substitute node is configured to transmit a detailed event item of the substitute node received from the control device to the relay node to join and store the detailed event item of the substitute node in the relay node, and wherein the substitute node is further configured to, when an event of the detailed event item is generated by the active node, perform a role of the active node through a relay of the relay node, wherein the control device is further configured to, when the control device does not receive an operation confirmation message from the relay node of the cluster after receiving an event generation message from the active node of the cluster, directly control a stop and a start of an operation of the active node of the cluster which includes the relay node that does not transmit the operation confirmation message and an operation of the substitute node of the cluster which includes the relay node that does not transmit the operation confirmation message, wherein the control device is further configured to determine whether or not a join completion message is received from the relay node of the cluster, and wherein the control device is further configured to, when the event generation message is received from the active node of the cluster which includes the relay node that does not transmit the join completion message, directly control the stop and the start of the operation of the active node of the cluster which includes the relay node that does not transmit the join completion message, and the operation of the substitute node of the cluster which includes the relay node that does not transmit the join completion message.

2. The network according to claim 1 , wherein the control device is further configured to create the cluster by clustering implant sensor nodes having the same cluster identifier by transmitting a cluster identifier to the plurality of implant sensor nodes; set the role of the each of the implant sensor nodes of the created cluster to be one of the relay node, the substitute node and the active node; stop the operation of the active node and starting the operation of the substitute node when the control device receives the operation confirmation message from the relay node, and store the cluster identifier, identifiers of the relay node, the substitute node and the active node of the cluster, and the detailed event item of the substitute node of the cluster.

3. The network according to claim 2 , wherein the relay node is configured to receive the detailed event item from a set substitute node, and join and store the detailed event item and the identifier of the substitute node, and wherein the relay node is further configured to, when the joining and storing of the detailed event item of the substitute node is completed, transmit the join completion message of the detailed event item to the control device.

4. The network according to claim 2 , wherein the active node is configured to, when the event of the detailed event item is generated, transmit the event generation message to the relay node and the control device, and wherein the relay node is further configured to, when receiving the event generation message from the active node, search for a substitute node of the detailed event item, corresponding to the event generation message, transmit an event confirmation message to the searched substitute node, and receive an event response message from the substitute node in response to the event confirmation message.

5. The network according to claim 4 , wherein the active node transmitting the event generation message is configured to stop its operation, wherein the substitute node receiving the event confirmation message is configured to start its operation, and wherein the relay node receiving the event response message is configured to transmit the operation confirmation message to the control device.